fix: input rename tag en dark theme

Ajout .settings-input: fond #2A2A2A, bordure #555, texte #ddd, focus bleu

app/templates/settings.html

@@ -61,6 +61,8 @@
 .modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.85);display:flex;align-items:center;justify-content:center;z-index:999;}
 .modal-box{background:#1E1E1E;border:1px solid #444;border-radius:12px;padding:24px;min-width:320px;box-shadow:0 12px 40px rgba(0,0,0,.8);}
 .modal-box h3{font-size:16px;font-weight:600;color:#fff;}
+.settings-input{background:#2A2A2A;border:1px solid #555;border-radius:6px;color:#ddd;font-size:13px;padding:6px 10px;outline:none;width:100%;}
+.settings-input:focus{border-color:var(--accent,#2383E2);box-shadow:0 0 0 2px rgba(35,131,226,.25);}
 .btn-danger{background:#E03E3E;color:#fff;border:none;padding:6px 16px;border-radius:6px;cursor:pointer;font-size:13px;}
 .btn-danger:hover{background:#C93535;}